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Schedule of Real Estate Owned and Occupied by the Company (Details) | Jun. 30, 2025 ft²
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Mortgage Operations [Member] |  |
Approximate square footage | 216,865 | [1]
Square footage occupied by the company | 50.00% | [1]
Life Insurance Operations [Member] |  |
Approximate square footage | 12,274 | [2]
Square footage occupied by the company | 100.00% | [2]
Life Insurance Sales [Member] |  |
Approximate square footage | 1,560 | [2],[3]
Square footage occupied by the company | 100.00% | [2],[3]
[1] | Included in real estate held for investment on the condensed consolidated balance sheets
[2] | Included in property and equipment on the condensed consolidated balance sheets
[3] | Listed for sale

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- Definition Represents the Approximate Square Footage, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the Square Footage Occupied by the Company, as of the indicated date. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |